Abstract
Partly purified membranes (with plasmalemma material) of Acetabularia mediterranea were studied with respect to ATPase activity in alkali- and Ca++-free media and its sensitivity to pH (5 – 9), oligomycin (200 ώg/mg protein), 100 ώM N-N′-dicyclohexylcarbodiimide (DCCD), and 50 ώM vanadate. Besides activities which may originate from mitochondrial H+ ATPase (oligomycin-sensitive, alkaline pH optimum) and tonoplast H+ ATPase (DCCD-sensitive, pH optimum 7.5), there is ATPase activity with a pH optimum around pH 6.5, sensitive to vanadate and insensitive to DCCD. These results strongly suggest that the electrogenic Cl− pump in the plasmalemma of Acetabularia is an ATPase. Effects of Mg++, Mg-ATP, ADP, GTP, UTP, CTP and HCO3 − versus Cl− on this ATPase activity are described.
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Communicated by P. Matile
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Goldfarb, V., Gradmann, D. ATPase activities in partially purified membranes of Acetabularia . Plant Cell Reports 2, 152–155 (1983). https://doi.org/10.1007/BF00269342
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DOI: https://doi.org/10.1007/BF00269342